638470651104 has 384 divisors, whose sum is σ = 2215493683200. Its totient is φ = 176329820160.

The previous prime is 638470651099. The next prime is 638470651153. The reversal of 638470651104 is 401156074836.

638470651104 is a `hidden beast` number, since 6 + 3 + 8 + 470 + 65 + 110 + 4 = 666.

638470651104 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 638470651104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9727902 + ... + 9793314.

It is an arithmetic number, because the mean of its divisors is an integer number (5769514800).

Almost surely, 2^638470651104 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 638470651104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1107746841600).

638470651104 is an abundant number, since it is smaller than the sum of its proper divisors (1577023032096).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

638470651104 is a wasteful number, since it uses less digits than its factorization.

638470651104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65535 (or 65521 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 638470651104 in words is "six hundred thirty-eight billion, four hundred seventy million, six hundred fifty-one thousand, one hundred four".